var ddaccordion = {

    contentclassname:{}, //object to store corresponding contentclass name based on headerclass

    expandone:function (headerclass, selected) { //PUBLIC function to expand a particular header
        this.toggleone(headerclass, selected, "expand")
    },

    collapseone:function (headerclass, selected) { //PUBLIC function to collapse a particular header
        this.toggleone(headerclass, selected, "collapse")
    },

    expandall:function (headerclass) { //PUBLIC function to expand all headers based on their shared CSS classname
        var $ = jQuery
        var $headers = $('.' + headerclass)
        $('.' + this.contentclassname[headerclass] + ':hidden').each(function () {
            $headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
        })
    },

    collapseall:function (headerclass) { //PUBLIC function to collapse all headers based on their shared CSS classname
        var $ = jQuery
        var $headers = $('.' + headerclass)
        $('.' + this.contentclassname[headerclass] + ':visible').each(function () {
            $headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
        })
    },

    toggleone:function (headerclass, selected, optstate) { //PUBLIC function to expand/ collapse a particular header
        var $ = jQuery
        var $targetHeader = $('.' + headerclass).eq(selected)
        var $subcontent = $('.' + this.contentclassname[headerclass]).eq(selected)
        if (typeof optstate == "undefined" || optstate == "expand" && $subcontent.is(":hidden") || optstate == "collapse" && $subcontent.is(":visible"))
            $targetHeader.trigger("evt_accordion")
    },

    expandit:function ($targetHeader, $targetContent, config, useractivated, directclick) {
        this.transformHeader($targetHeader, config, "expand")
        $targetContent.slideDown(config.animatespeed, function () {
            config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), useractivated)
            if (config.postreveal == "gotourl" && directclick) { //if revealtype is "Go to Header URL upon click", and this is a direct click on the header
                var targetLink = ($targetHeader.is("a")) ? $targetHeader.get(0) : $targetHeader.find('a:eq(0)').get(0)
                if (targetLink) //if this header is a link
                    setTimeout(function () {
                        location = targetLink.href
                    }, 200) //ignore link target, as window.open(targetLink, targetLink.target) doesn't work in FF if popup blocker enabled
            }
        })
    },

    collapseit:function ($targetHeader, $targetContent, config, isuseractivated) {
        this.transformHeader($targetHeader, config, "collapse")
        $targetContent.slideUp(config.animatespeed, function () {
            config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), isuseractivated)
        })
    },

    transformHeader:function ($targetHeader, config, state) {
        $targetHeader.addClass((state == "expand") ? config.cssclass.expand : config.cssclass.collapse)//alternate btw "expand" and "collapse" CSS classes
            .removeClass((state == "expand") ? config.cssclass.collapse : config.cssclass.expand)
        if (config.htmlsetting.location == 'src') { //Change header image (assuming header is an image)?
            $targetHeader = ($targetHeader.is("img")) ? $targetHeader : $targetHeader.find('img').eq(0) //Set target to either header itself, or first image within header
            $targetHeader.attr('src', (state == "expand") ? config.htmlsetting.expand : config.htmlsetting.collapse) //change header image
        }
        else if (config.htmlsetting.location == "prefix") //if change "prefix" HTML, locate dynamically added ".accordprefix" span tag and change it
            $targetHeader.find('.accordprefix').html((state == "expand") ? config.htmlsetting.expand : config.htmlsetting.collapse)
        else if (config.htmlsetting.location == "suffix")
            $targetHeader.find('.accordsuffix').html((state == "expand") ? config.htmlsetting.expand : config.htmlsetting.collapse)
    },

    urlparamselect:function (headerclass) {
        var result = window.location.search.match(new RegExp(headerclass + "=((\\d+)(,(\\d+))*)", "i")) //check for "?headerclass=2,3,4" in URL
        if (result != null)
            result = RegExp.$1.split(',')
        return result //returns null, [index], or [index1,index2,etc], where index are the desired selected header indices
    },

    getCookie:function (Name) {
        var re = new RegExp(Name + "=[^;]+", "i") //construct RE to search for target name/value pair
        if (document.cookie.match(re)) //if cookie found
            return document.cookie.match(re)[0].split("=")[1] //return its value
        return null
    },

    setCookie:function (name, value) {
        document.cookie = name + "=" + value + "; path=/"
    },

    init:function (config) {
        document.write('<style type="text/css">\n')
        document.write('.' + config.contentclass + '{display: none}\n') //generate CSS to hide contents
        document.write('<\/style>')
        jQuery(document).ready(function ($) {
            ddaccordion.urlparamselect(config.headerclass)
            var persistedheaders = ddaccordion.getCookie(config.headerclass)
            ddaccordion.contentclassname[config.headerclass] = config.contentclass //remember contentclass name based on headerclass
            config.cssclass = {collapse:config.toggleclass[0], expand:config.toggleclass[1]} //store expand and contract CSS classes as object properties
            config.revealtype = config.revealtype || "click"
            config.revealtype = config.revealtype.replace(/mouseover/i, "mouseenter")
            if (config.revealtype == "clickgo") {
                config.postreveal = "gotourl" //remember added action
                config.revealtype = "click" //overwrite revealtype to "click" keyword
            }
            if (typeof config.togglehtml == "undefined")
                config.htmlsetting = {location:"none"}
            else
                config.htmlsetting = {location:config.togglehtml[0], collapse:config.togglehtml[1], expand:config.togglehtml[2]} //store HTML settings as object properties
            config.oninit = (typeof config.oninit == "undefined") ? function () {
            } : config.oninit //attach custom "oninit" event handler
            config.onopenclose = (typeof config.onopenclose == "undefined") ? function () {
            } : config.onopenclose //attach custom "onopenclose" event handler
            var lastexpanded = {} //object to hold reference to last expanded header and content (jquery objects)
            var expandedindices = ddaccordion.urlparamselect(config.headerclass) || ((config.persiststate && persistedheaders != null) ? persistedheaders : config.defaultexpanded)
            if (typeof expandedindices == 'string') //test for string value (exception is config.defaultexpanded, which is an array)
                expandedindices = expandedindices.replace(/c/ig, '').split(',') //transform string value to an array (ie: "c1,c2,c3" becomes [1,2,3]
            var $subcontents = $('.' + config["contentclass"])
            if (expandedindices.length == 1 && expandedindices[0] == "-1") //check for expandedindices value of [-1], indicating persistence is on and no content expanded
                expandedindices = []
            if (config["collapseprev"] && expandedindices.length > 1) //only allow one content open?
                expandedindices = [expandedindices.pop()] //return last array element as an array (for sake of jQuery.inArray())
            if (config["onemustopen"] && expandedindices.length == 0) //if at least one content should be open at all times and none are, open 1st header
                expandedindices = [0]
            $('.' + config["headerclass"]).each(function (index) { //loop through all headers
                if (/(prefix)|(suffix)/i.test(config.htmlsetting.location) && $(this).html() != "") { //add a SPAN element to header depending on user setting and if header is a container tag
                    $('<span class="accordprefix"></span>').prependTo(this)
                    $('<span class="accordsuffix"></span>').appendTo(this)
                }
                $(this).attr('headerindex', index + 'h') //store position of this header relative to its peers
                $subcontents.eq(index).attr('contentindex', index + 'c') //store position of this content relative to its peers
                var $subcontent = $subcontents.eq(index)
                var needle = (typeof expandedindices[0] == "number") ? index : index + '' //check for data type within expandedindices array- index should match that type
                if (jQuery.inArray(needle, expandedindices) != -1) { //check for headers that should be expanded automatically (convert index to string first)
                    if (config.animatedefault == false)
                        $subcontent.show()
                    ddaccordion.expandit($(this), $subcontent, config, false) //Last param sets 'isuseractivated' parameter
                    lastexpanded = {$header:$(this), $content:$subcontent}
                }  //end check
                else {
                    $subcontent.hide()
                    config.onopenclose($(this).get(0), parseInt($(this).attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter
                    ddaccordion.transformHeader($(this), config, "collapse")
                }
            })
            $('.' + config["headerclass"]).bind("evt_accordion", function (e, isdirectclick) { //assign custom event handler that expands/ contacts a header
                var $subcontent = $subcontents.eq(parseInt($(this).attr('headerindex'))) //get subcontent that should be expanded/collapsed
                if ($subcontent.css('display') == "none") {
                    ddaccordion.expandit($(this), $subcontent, config, true, isdirectclick) //2nd last param sets 'isuseractivated' parameter
                    if (config["collapseprev"] && lastexpanded.$header && $(this).get(0) != lastexpanded.$header.get(0)) { //collapse previous content?
                        ddaccordion.collapseit(lastexpanded.$header, lastexpanded.$content, config, true) //Last Boolean value sets 'isuseractivated' parameter
                    }
                    lastexpanded = {$header:$(this), $content:$subcontent}
                }
                else if (!config["onemustopen"] || config["onemustopen"] && lastexpanded.$header && $(this).get(0) != lastexpanded.$header.get(0)) {
                    ddaccordion.collapseit($(this), $subcontent, config, true) //Last Boolean value sets 'isuseractivated' parameter
                }
            })
            $('.' + config["headerclass"]).bind(config.revealtype, function () {
                if (config.revealtype == "mouseenter") {
                    clearTimeout(config.revealdelay)
                    var headerindex = parseInt($(this).attr("headerindex"))
                    config.revealdelay = setTimeout(function () {
                        ddaccordion.expandone(config["headerclass"], headerindex)
                    }, config.mouseoverdelay || 0)
                }
                else {
                    $(this).trigger("evt_accordion", [true])
                    return false //cancel default click behavior
                }
            })
            $('.' + config["headerclass"]).bind("mouseleave", function () {
                clearTimeout(config.revealdelay)
            })
            config.oninit($('.' + config["headerclass"]).get(), expandedindices)
            $(window).bind('unload', function () { //clean up and persist on page unload
                $('.' + config["headerclass"]).unbind()
                var expandedindices = []
                $('.' + config["contentclass"] + ":visible").each(function (index) { //get indices of expanded headers
                    expandedindices.push($(this).attr('contentindex'))
                })
                if (config.persiststate == true && $('.' + config["headerclass"]).length > 0) { //persist state?
                    expandedindices = (expandedindices.length == 0) ? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
                    ddaccordion.setCookie(config.headerclass, expandedindices)
                }
            })
        })
    }
}